Method of producing tubes and a rolling mill train for producing tubes

A method for producing tubes for use in a heat exchanger comprising:

• providing a first metallic strip and a second metallic strip on a rolling mill train with predetermined breaking points using a device;
• deforming the first and the second metallic strips to form a tube;
• separating individual tubes from the tube at the predetermined breaking points that have previously been made to coincide;
• sensing positions of the predetermined breaking points in the first metallic strip and the second metallic strip using a sensing element which the first metallic strip and the second metallic strip pass through;
• transmitting signals relating to sensed positions of the predetermined breaking points of the first and the second metallic strips to a computer;
• comparing the sensed positions of the predetermined breaking points in the first and the second metallic strips using the computer on the basis of the signals transmitted;
• and
• sending signals to the device using the computer which lead to aligning the positions of the predetermined breaking points in the first and the second metallic strips.

A rolling mill train for carrying out a process for producing tubes from a first metallic strip and a second metallic strip, the rolling mill train comprising:

• pairs of rolls;
• a device for introducing predetermined breaking points in the first and the second metallic strips;
• means for making the predetermined breaking points in the first metallic strip and the second metallic strip coincide;
• at least one sensing element for determining the positions of the predetermined breaking points;
• and
• a computer connected to the at least one sensing element and to the device.